The MED PA is not intended to be advertised outside the AS that heard the MED in an incoming BGP Update. Typically, and as shown in the examples in this section, the MED can be set in an outbound route map by a router in one AS to influence the BGP decision process in another AS. So, the MED value is set by routers in one AS, and learned by routers in another AS. However, after reaching the other AS, the MED is advertised inside the AS, but not outside the AS. For example, ..
The show ip route command is one of the most useful commands available for understanding and troubleshooting an IP network. Example 7-10 shows an example of a routing table in a multi-area network. Example 7-10. The show ip route Command Output Table 7-4 shows the link-state advertisement (LSA) codes used in the routing table, allowing you to analyze the flow of LSAs both within and between the areas. Table 7-4. OSPF Routing Table Codes and Associated LSAs
As mentioned in the previous section, instability in neighboring ASs can cause scaling problems in a network. However, most administrators have a critical need for intelligent routing in the core or distribution sites. Usually, the core sites are high-CPU boxes and can handle flaps much more gracefully than remote locating low-end routers. The administrator needs full routing information in certain parts of the network, but you cannot allow routing information i..
Security Information Monitoring System
This section covers how Cisco IDS can monitor and identify intruder-based attacks and how security information is monitored and acted upon. Cisco IDS uses multilayer protection options to prevent an attack from successfully reaching the end target system such as a file server or desktop computer. After the attack or intruder-based traffic is identified and determined to be intrusive, the network administrator can stop the attack before any serious damage occurs. This can inv..
Before moving into the configuration example, this section gives a brief overview of the operation of MIB and how it can be applicable to ELMI Address Registration. In Example 13-7, the snmp-server community command is configured on router R1 to allow SNMP Read Only access to the router using the "public" community string. The complete syntax for the snmp-server community command is as follows: Router(config)#snmp-server community string [view view-name] [ro | rw] [number] ..
